TMMDB3TG

DIACs, SIDACs Overview

The TMMDB3TG is a bidirectional trigger diode (Diac) manufactured by STMicroelectronics, designed for simplified gate control circuits and fluorescent lamp ballasts. It operates in the Mini MELF surface-mount package with a breakover voltage range of 30 V to 34 V and a nominal turn-on voltage of 32 V. The device supports a maximum breakover current of 15 µA and functions within an operating temperature range of -40 °C to +125 °C. Key electrical specifications include a repetitive peak off-state voltage capability suitable for standard AC line applications and low triggering current requirements for efficient triac interface.

DIACs, SIDACs Feature Summary

• Provides a fixed voltage reference for reliable triac gate triggering
• Enables simplified circuit design for phase control applications
• Suitable for use as a starting element in lighting ballasts

DIACs, SIDACs Applications

• Triac gate control circuits
• Fluorescent lamp ballasts
• Light dimmer phase control
• Motor speed controllers

DIACs, SIDACs Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm the presence of official marking codes and datasheet revision alignment. Request batch traceability documentation to ensure compliance with specified temperature ranges and electrical tolerances. Validate packaging integrity against moisture sensitivity levels prior to assembly.

DIACs, SIDACs Selection Notes

Select this component when a stable breakover voltage near 32 V is required for triggering thyristors or triacs. Ensure the application environment remains within the -40 °C to +125 °C operational limits. Consider the Mini MELF package constraints for PCB layout and thermal management. Verify that the low breakover current specification meets the drive capabilities of the target control circuitry.

DIACs, SIDACs Part Context

This Diac belongs to the TMMDB series of trigger devices from STMicroelectronics. It serves as a fundamental switching element in AC power control systems. The device complements other thyristor family components by providing precise voltage threshold detection for symmetrical conduction initiation.

DIACs, SIDACs Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-referencing with generic DIAC equivalents requires independent verification of electrical parameters and package dimensions.